package com.bennu.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bennu.common.BaseContext;
import com.bennu.common.CustomException;
import com.bennu.domain.*;
import com.bennu.mapper.OrderMapper;
import com.bennu.service.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    //用户下单
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获取当前用户id
        Long currentId = BaseContext.getCurrentId();
        //查询当前用户购物车数据
        LambdaQueryWrapper<ShoppingCart> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq( ShoppingCart::getUserId,currentId );
        List<ShoppingCart> list = shoppingCartService.list( queryWrapper );
        if ( list==null || list.size()==0 ){
            throw  new CustomException( "购物车为空，不能下单" );
        }
        //查询用户数据
        User user = userService.getById( currentId );
        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById( addressBookId );
        if ( addressBook==null  ){
            throw  new CustomException( "地址信息有误，不能下单" );
        }
        //mp提供IdWorker（生成订单号）
        long orderId = IdWorker.getId();
        //原子操作，保证多线程下计算正确，保证线程安全
        AtomicInteger amount=new AtomicInteger(0);
        //遍历购物车，获取金额累加金额
        List<OrderDetail> orderDetails=list.stream().map( (item)->{
            OrderDetail orderDetail=new OrderDetail();
            //关联订单号
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //进行累加
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;

        } ).collect( Collectors.toList() );

        //向订单明细表插入数据，一条数据
        //设置id值
        orders.setId( orderId );
        //设置一个订单号
        orders.setNumber( String.valueOf( orderId ) );
        //下单时间
        orders.setOrderTime( LocalDateTime.now() );
        //结账时间
        orders.setCheckoutTime( LocalDateTime.now() );
        //状态
        orders.setStatus( 2 );
        //订单总金额
        orders.setAmount( new BigDecimal( amount.get() ) );
        //用户id
        orders.setUserId( currentId );
        //用户信息
        orders.setUserName( user.getName() );
        //收货人
        orders.setConsignee( addressBook.getConsignee() );
        //手机号
        orders.setPhone( addressBook.getPhone() );
        //地址
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                          + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                          + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                          + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据，一条数据
        this.save( orders );
        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch( orderDetails );
        //下单完成之后清空购物车
        shoppingCartService.remove( queryWrapper );
    }
}
